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DTC P0117: Engine Coolant Temperature (ECT) Circuit Low Input

  1. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Select ECT parameter. If display reads 246°F (119°C), turn ignition off and go to next step. If display reading is not 246°F (119°C), check for an intermittent problem. Go to INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
  2. Disconnect ECT sensor harness connector located near coolant outlet. Turn ignition on. If display reading on scan tool changes to -40°F (-40°C), replace ECT sensor. If reading is not -40°F (-40°C), check Light Green/Red wire (Esteem) or Gray/White wire (Swift) for short to ground. Repair as necessary. If wire is okay, replace PCM. Retest system.
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